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authorAntti Palosaari <crope@iki.fi>2014-12-16 14:51:33 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-02-03 16:20:02 -0200
commita08c3781194142cce39bbb739373efc8dacaa1fa (patch)
tree2ede8612d68c74df6982ba94bb25e0a4cf42a7a4 /drivers/media
parent75c24005eeec0613c319a577c613182ead017cff (diff)
downloadlinux-a08c3781194142cce39bbb739373efc8dacaa1fa.tar.bz2
[media] rtl2832: implement sleep
Put demod to soft reset in order to save power when sleep. That drops power usage ~30mA @5V on USB dongle I tested. In real life it does not matter much as USB IF powers off demod too, but now it is done twice - demod and USB IF. Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb-frontends/rtl2832.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c
index e5f7d7925c85..e80c6b974f4c 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -410,13 +410,23 @@ static int rtl2832_sleep(struct dvb_frontend *fe)
{
struct rtl2832_dev *dev = fe->demodulator_priv;
struct i2c_client *client = dev->client;
+ int ret;
dev_dbg(&client->dev, "\n");
+
dev->sleeping = true;
/* stop statistics polling */
cancel_delayed_work_sync(&dev->stat_work);
dev->fe_status = 0;
+
+ ret = rtl2832_wr_demod_reg(dev, DVBT_SOFT_RST, 0x1);
+ if (ret)
+ goto err;
+
return 0;
+err:
+ dev_dbg(&client->dev, "failed=%d\n", ret);
+ return ret;
}
static int rtl2832_get_tune_settings(struct dvb_frontend *fe,